Section-insulator



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E. ,J. COOK. SECTION INSULATOR.

(Application filed Mar. 5, 1898.) (No Model.)

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Patented Mar. 2|, 1899,;

UNITED STATES PATENT I OFFICE.

EDWARD J. COOK, OF CLEVELAND, OHIO.

SECTION-INSULATOR.

SPECIFICATION forming part of Letters Patent No. 621,631, dated March21, 1899.

Application filed March 5, 1898.

To all whom it may concern.-

Beitknown that I, EDWARD J. 000K, a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented certain new and useful Improvements in Section-Insulators, ofwhich the following is a specification.

My invention relates to'improvements in section-insulators for trolleysystems of electric railways; and the object of my invention is toproduce an insulator to be used between the different sections ofoverhead or trolley lines which will be simple in construction andefficient in operation and adapted to withstand the longitudinal strainof the trolleywires.

The invention consists in the various constructions and combinations ofparts hereinafter described, and set forth in the claims.

In the accompanying drawings, Figure 1 is a side view of a device,showing my invention, some of the parts being broken away. Fig. 2 is aplan View of one of the end pieces of my device. Fig. 3.is a sidesectional elevation of one of the end pieces. Fig. 4 is a sectional Viewon line a; 00 in Fig. 3. Fig. 5 is an end view of the end. piece shownin Fig. 3. Fig. 6 is a side sectional iew of one of the end piecesmodified in form. Fig. 7 is an end view of the modification shown inFig.

6. Fig. Sis also a modification of the end piece. Fig. 9 is an end viewof the modification shown in Fig. 8. Fig. 10 is a modification of theend piece of my device. Fig. 11 is a detail View of the serrated clutchhereinafter referred to.

Like parts are represented by similar letters of reference in theseveral views.

In constructing my improved insulator I employa main portion or body a,which may be made of wood or any suitable insulating material. The lowerends of said main portion are cut away to form seats for end pieces aat". These end pieces are preferably made of metal and formed with atoothpick-point a which extends beyond the end of the body a. Beginningat said point and extending upwardly and inwardly at an angle to thebottom of said end piece is a slot or channel a for the wire Z. Thischannel at its inner end isenlarged, as shown at a. This end piece isfurther provided with upwardly-extend- Seria1No.672,685. (No model.)

ing transverse ribs in flanges 6L6 and m the flange a being the longer.The body at that part which is adapted to stand above the flange a iscut away, forming atransverse slot, into which the flange fits. Theflanges are enlarged at their centers and tapped and screw-threadedwithin to receive the studscrews 61/ which extend through the body fromthe top. The end pieces are formed with laterally-projecting anddownwardly-extending flanges at which are adapted to break the are bycontacting with the flanges of the trolley-wheel, and thus graduallypressing the trolley-wheel out of contact with the bottom of the endpiece, thus preventing the burning of the insulating material at thebottom where it joins the end piece and forms a track for the trolley;Said flanges extend in- Wardly past the body of the endpieces, so if anyare occurs it will be between the trolley and flanges and not along thetrack portion or the bottom of the insulator. The end pieces are formedwith toothpick-points at their outer lower ends, as shown in thedrawings. These toothpick-points are adapted to guide the trolley-wheelonto the insulator and to carry said wheel gradually from the wire tothe plane of the body of the insulator at its lower side.

The lower edge of the body between the end pieces is preferably straightand on a line with the inner lower corners of said end pieces and, ifdesired, may be separate from the main body, so as to be removabletherefrom, as indicated by dotted lines in Fig. 1. The lower edges ofthe end pieces extend slightly upwardly from their inner to their outeror toothpick ends.

The wire Z is adapted to extend into the inner end of the channel awhich has inclined or wedge-shaped walls, and around this por tion I fita chuck, which is serrated on itsinner periphery, and formed on itsouter periphery to conform to the enlarged portion of the channel. Thischuck is preferably split, so that the harder the strain on the wire thetighter the chuck will hold it on account of its wedge-shaped outerperiphery, the serrations in the chuck being adapted to seat themselvesin the soft wire.

It is obvious that different means may be employed for securing the wirein the chan nel, and I do not limit myself to any particular device.

In Figs. 6, 7, and 8 I have shown a modification of the end piece for mydevice. In this device the end piece is formed flat on top and has atransverse rib or flange 73 which accomplishes the same object as theflange 0.

The wire-channel or that portion of it in the toothpick end is formed inthe nature of a chamfered groove open at the bottom. In this theenlarged portion of the channel is formed with a square shoulder 19. Theend of the wire is upset, and the enlarged portion of the wire isadapted to rest against the shoulders b. This end piece is provided withan arm I), which extends upwardly along the end of the body and alongthe top and above the enlarged portion of the wire-channel. The endpiece is secured to the body by means of a bolt 6 which passes throughthe arm I), through the body, and into the body of the end piece.

111 Fig. 9 I have also shown the end piece flat on top, but with thetransverse rib or flange b In this the wire-channel lies parallel withthe top of the end piece and also has the enlarged portion. The partbelow the channel is formed in the nature of a fin and extendsdownwardly and inwardly to the body portion.

111 Fig. 10 I have shown the fin as in Fig.

9, but with the lower edge thereof at a less angle to the top of the endpiece. In this the channel lies substantially parallel to the lower edgeof the fin.

Having thus described my invention, I claim- I 1. A metallic end piecefor section-insulators having a wire-channel, a toothpick end and anarc-breaking flange, substantially as specified.

2. In a metallic end piece for section-insulators, a wire-channelenlarged at its inner end, a trolley-wire and means for holding same insaid channel, a toothpick end, and an arcbreaking flange extendingbeyond the inner end of said end piece, substantially as specified.

3. In a metallic end piece for section-insulators, the combination of awire-channel enlarged at its inner end and having inclined walls, atoothpick outer end, a trolley-wire within said channel and means forfastening said trolley-wire to said wire-channel.

In testimony whereof I have hereunto set my hand this 28th day ofFebruary, A. 1). 1898.

ED\VARD J. COOK.

Witnesses:

A. W. SWEENEY, E. L. SCHMOCK.

